Alternator, not enough?

K Spec

New Member
May 14, 2006
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San Diego
I've had some problems with my battery, sliding around and one of the wires, tearing out of the positive terminal. Point is, it barely runs, with the battery terminal, disconnected. Most cars, only need a battery to get started and the alternator does the rest.
Does the Supra, draw more power, than the alternator can produce, at idle?